Microsoft Bookings Not Showing All Available Time Slots

The described behavior is consistent with how Microsoft Bookings combines service availability, staff availability, and scheduling policy, even when “Events on Office Calendar affect availability” is unchecked.

Key points from the configuration model in Bookings:

1. Service availability vs. staff availability
   • Service availability can be:
     • Bookable when staff are free
     • Not bookable
     • Custom hours
   • Staff availability is configured per staff member (business hours or custom hours). A service that is “Bookable when staff are free” will only show time slots where at least one staff member who provides that service is available.
   • If any staff member has different custom hours, or no availability set for a given day, Bookings may only surface a subset of the expected time slots.
   Action:
   • For each of the 5 staff members, open their Staff settings and confirm:
     • “Use business hours” vs. custom hours is set consistently.
     • Custom hours include both 10–11 AM and 1–2 PM on the affected days.
     • There are no days with no availability defined (which would make that staff member unavailable that day).
2. Service availability configuration
   • For the service being booked, open the service settings and check Availability Options:
     • Confirm whether the service is set to “Bookable when staff are free” or “Custom hours”.
     • If using “Custom hours” at the service level, ensure the service’s custom hours also include both 10–11 AM and 1–2 PM for all relevant weekdays.
     • Check if any “Set availability for a different date range” entries exist. Date-range overrides will supersede the general weekly schedule and can cause specific dates (like 4/13, 4/15, 4/22, 4/23) to show only one slot or fewer slots.
   Action:
   • In the service’s Availability Options, review all date ranges:
     • Remove or adjust any date-range entries that mark those dates as “Not bookable” or that define narrower hours.
3. Scheduling policy (lead time)
   • The scheduling policy uses Minimum lead time (hours) and Maximum lead time (days).
   • There must be at least 24 hours between Minimum and Maximum lead time, and the combination controls which future dates and times can be booked.
   • If Minimum lead time is 24 hours, then any slot that falls within the next 24 hours from “now” will not appear as available.
   Action:
   • Check the service’s scheduling policy:
     • Confirm Minimum lead time is not excluding the morning slot when viewing close to the current time.
     • Verify Maximum lead time is far enough in the future to include all the dates being checked.
4. Time zone behavior
   • All configured working hours and staff availability are in the business time zone.
   • The self-service page can show times in the customer’s local time zone unless “Always show time slots in business time zone” is enabled.
   • If the browser or viewer is in a different time zone, 10–11 AM and 1–2 PM business time may appear as different local times, and some may fall outside the visible or expected window.
   Action:
   • Confirm the business time zone in Bookings.
   • View the booking page with “Always show time slots in business time zone” enabled (on the Bookings Page tab) to verify that both slots exist in business time.
5. Staff calendar impact setting
   • “Events on Microsoft 365 calendar affect availability” (per staff) controls whether free/busy from staff calendars blocks slots.
   • This is on by default and recommended to prevent double-booking.
   • In this scenario it is unchecked, so Outlook calendar events should not be blocking slots. However, if any staff are external (outside the tenant), their free/busy is never shared with Bookings regardless of this setting.
   Action:
   • Confirm that all 5 staff are internal users if expecting Bookings to consider them as a pool.
   • If some staff are external, Bookings will not use their free/busy; ensure at least one internal staff member is available for each slot.

Summary of concrete checks:

1. For each staff member:
   • Verify custom hours include 10–11 AM and 1–2 PM on all weekdays.
   • Ensure no missing availability on the specific dates.
2. For the service:
   • Confirm Availability Options are either:
     • “Bookable when staff are free” with correctly configured staff hours, or
     • “Custom hours” that explicitly include both time ranges for all weekdays.
   • Review and remove/adjust any “Set availability for a different date range” overrides that affect the listed dates.
3. For scheduling policy:
   • Confirm Minimum lead time and Maximum lead time do not exclude the missing slots based on the current date/time.
4. For time zones:
   • Verify business time zone and test with “Always show time slots in business time zone” to rule out time zone shifts.

If, after aligning staff hours, service availability (including date ranges), scheduling policy, and time zone, the problem persists on unsent calendars, the next step is to temporarily set the service to “Custom hours” at the service level (matching 10–11 and 1–2) and test again. This isolates whether the issue is with staff-level availability vs. service-level configuration.

References:

• Configure service availability in Microsoft Bookings
• Shared Bookings Frequently Asked Questions (FAQ)
• Add team members to Bookings
• Adding staff availability in Microsoft Bookings
• Personal Bookings Frequently Asked Questions (FAQ)